Dual telephone base



FIG. 1 is a perspective view of a dual telephone base, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is an elevational view from the left side thereof.

The bottom surface, not shown, is plain and unornamented.

The broken line showing of a telephone handset and keypad in FIG. 1 and of a keypad of FIG. 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a dual telephone base, as shown and described. 